.page-faq {
  --faq-rail-w: 264px;
  color: var(--frost);
  background: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px) 0 clamp(26px, 4vw, 48px);
  background: linear-gradient(180deg, var(--ink-deep), var(--ink) 90%);
  border-bottom: 1px solid var(--rule);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--rule-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule-soft) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
}

.page-faq .faq-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__kicker {
  margin: clamp(20px, 3vw, 34px) 0 0;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-size: var(--fs-96);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--frost);
}

.page-faq .faq-hero__hl {
  color: var(--orange);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(24px, 4vw, 46px);
}

.page-faq .faq-hero__lede {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--fs-19);
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .faq-hot {
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}

.page-faq .faq-hot__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hot__tag {
  display: inline-block;
  padding: 8px 13px;
  border: 1px solid var(--rule);
  color: var(--cyan);
  font-size: var(--fs-13);
  letter-spacing: .02em;
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-hot__tag:hover {
  border-color: var(--cyan);
  color: var(--frost);
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: clamp(30px, 4.4vw, 58px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(52px, 7vw, 100px);
}

.page-faq .faq-body {
  display: grid;
  gap: clamp(34px, 5vw, 60px);
  min-width: 0;
}

/* ---------- 左栏索引 ---------- */

.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail__title {
  margin: 0;
  color: var(--muted);
}

.page-faq .faq-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
  padding-top: 10px;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid transparent;
  color: var(--silver);
  font-size: var(--fs-15);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--frost);
  border-color: var(--cyan);
}

.page-faq .faq-rail__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-rail__hint {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--rule-soft);
  font-size: var(--fs-13);
  line-height: 1.8;
  color: var(--dim);
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 108px;
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  transition: border-color .28s var(--ease);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: var(--fs-24);
  font-weight: 300;
  letter-spacing: -0.005em;
  line-height: 1.4;
  color: var(--frost);
}

.page-faq .faq-group:target .faq-group__head {
  border-top-color: var(--orange);
}

.page-faq .faq-group:target .faq-group__head .label--num {
  color: var(--orange);
}

/* ---------- 插图 ---------- */

.page-faq .faq-figure {
  margin: 20px 0 6px;
  border: 1px solid var(--rule);
  background: var(--ink-deep);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-figure--narrow {
  max-width: 720px;
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-item {
  border-bottom: 1px solid var(--rule-soft);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 19px 0;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-19);
  line-height: 1.55;
  color: var(--frost);
  transition: color .2s var(--ease);
}

.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__idx {
  flex: none;
  min-width: 42px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-faq .faq-item__text {
  min-width: 0;
}

.page-faq .faq-item__q::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  transform: rotate(45deg);
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .faq-item__q:hover {
  color: var(--cyan);
}

.page-faq .faq-item__q:hover::after {
  border-color: var(--cyan);
}

.page-faq .faq-item__a {
  padding: 0 0 24px 56px;
}

.page-faq .faq-item__a p {
  max-width: 38em;
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .faq-item__a a,
.page-faq .faq-contact__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .34);
}

.page-faq .faq-item__a a:hover,
.page-faq .faq-contact__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 联系方式面板 ---------- */

.page-faq .faq-contact {
  margin-top: 26px;
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--rule);
  background: linear-gradient(135deg, var(--panel), var(--ink-deep) 82%);
}

.page-faq .faq-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding: 13px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.page-faq .faq-contact__row:last-of-type {
  border-bottom: 0;
}

.page-faq .faq-contact__k {
  flex: none;
  min-width: 96px;
  color: var(--muted);
}

.page-faq .faq-contact__v {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  color: var(--frost);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__note {
  max-width: 46em;
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: var(--fs-13);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 焦点与动效 ---------- */

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-hot__tag,
  .page-faq .faq-rail__link,
  .page-faq .faq-group__head {
    transition: none;
  }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 620px) {
  .page-faq .faq-item__a {
    padding-left: 0;
  }

  .page-faq .faq-item__q {
    gap: 10px;
    font-size: var(--fs-15);
    align-items: flex-start;
  }

  .page-faq .faq-item__idx {
    min-width: 34px;
    padding-top: 2px;
  }

  .page-faq .faq-item__q::after {
    margin-top: 6px;
  }

  .page-faq .faq-contact__k {
    min-width: 100%;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-rail__list {
    display: block;
    padding-top: 8px;
  }

  .page-faq .faq-rail__link {
    border-left: 2px solid transparent;
    border-top: 0;
    border-right: 0;
    border-bottom: 0;
    padding: 10px 10px 10px 12px;
  }

  .page-faq .faq-rail__link:hover {
    border-color: transparent;
    border-left-color: var(--cyan);
    color: var(--frost);
  }
}